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Biden says federalism is emerging as one approach to Iraq's future. He's alluding to a plan he proposed in 2006 that would see Iraq divided into three semi-independent regions for Shiites, Sunnis and Kurds.

Biden says such a plan would keep Iraq united, protect local populations and ensure oil revenues are shared fairly, while squeezing the Islamic State group.

He says the U.S. would offer training and other assistance to help that model of government succeed.